com.rabbitmq.client.impl.recovery.RecoveryAwareAMQConnectionFactory Maven / Gradle / Ivy

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The RabbitMQ Java client library allows Java applications to interface with RabbitMQ.

There is a newer version: 5.22.0

package com.rabbitmq.client.impl.recovery;

import com.rabbitmq.client.Address;
import com.rabbitmq.client.impl.ConnectionParams;
import com.rabbitmq.client.impl.FrameHandler;
import com.rabbitmq.client.impl.FrameHandlerFactory;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

public class RecoveryAwareAMQConnectionFactory {
    private final ConnectionParams params;
    private final FrameHandlerFactory factory;
    private final Address[] addrs;

    public RecoveryAwareAMQConnectionFactory(ConnectionParams params, FrameHandlerFactory factory, Address[] addrs) {
        this.params = params;
        this.factory = factory;
        this.addrs = addrs;
    }

    /**
     * @return an interface to the connection
     * @throws java.io.IOException if it encounters a problem
     */
    RecoveryAwareAMQConnection newConnection() throws IOException
    {
        IOException lastException = null;
        for (Address addr : shuffle(addrs)) {
            try {
                FrameHandler frameHandler = factory.create(addr);
                RecoveryAwareAMQConnection conn = new RecoveryAwareAMQConnection(params, frameHandler);
                conn.start();
                return conn;
            } catch (IOException e) {
                lastException = e;
            }
        }

        throw (lastException != null) ? lastException : new IOException("failed to connect");
    }

    private Address[] shuffle(Address[] addrs) {
        List list = new ArrayList(Arrays.asList(addrs));
        Collections.shuffle(list);
        Address[] result = new Address[addrs.length];
        list.toArray(result);
        return result;
    }
}